Honestly, idk if 'chronically online' would describe them nearly as well as just 'super toxic and mean', but there are certainly people like this out there.

I think that it can come from many angles, too, which kind of sucks. There are toxic, elitist, gatekeepers that are super into literature in general... and there are toxic gatekeepers who swarm around a given author or franchise (not to name any examples lol). I'm sure that if you really wanna get into it, there's more than just these two levels of toxicity in literature circles, but it's a heck of a thing.